Under Armour is famous for being the ultimate in sport performance, and for a good reason. They feature premium moisture transportation combined with ideal ventilation. Under Armour apparel wicks away sweat from the skin to keep you dry and keep your body temperature consistent in any playing condition. Play in the cold with lightweight Cold Gear and take on the heat with Heat Gear with odor control plus UPF. Flatlock seaming construction enables the smoothest feel and fit, preventing chafing and keeping you focused on tennis, and not your sportswear. The original high-performance gear, Under Armour remains the brand to beat in high-tech apparel for the serious athletes like Sloane Stephens.